Tapering For A Chimney

fosgate3

Hello! I have to say that it's been some many years since I worked on a chimney. I'm building a house and we ran into a question about the chimney that I wasn't sure how to answer. I hope I can make this make sense:

The damper on the chimney is 36 inches but the flu opening is 13 inches; so, we need to taper the chimney from 36 to 13. What is the angle/degree of taper and how high do we need to go with it so that it will be stable? Also, should I put in firebrick above the damper through the taper?

Thanks so much for your help!!

Tscarborough

http://www.vestalmfg.com/PDF/FireplaceThroatDampers.pdf

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It ain't Rocket Science unless you are building rockets.

BrickieWannaBe

Great Info Tscar!